GB466251A - Improvements in and relating to electric cutouts - Google Patents
Improvements in and relating to electric cutoutsInfo
- Publication number
- GB466251A GB466251A GB28542/36A GB2854236A GB466251A GB 466251 A GB466251 A GB 466251A GB 28542/36 A GB28542/36 A GB 28542/36A GB 2854236 A GB2854236 A GB 2854236A GB 466251 A GB466251 A GB 466251A
- Authority
- GB
- United Kingdom
- Prior art keywords
- coating
- metal
- thickness
- oxide
- breakdown value
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01C—RESISTORS
- H01C7/00—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material
- H01C7/10—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material voltage responsive, i.e. varistors
Landscapes
- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Chemical Treatment Of Metals (AREA)
Abstract
Metal oxide cutouts are made by oxidizing the metal to form an oxide coating having a thickness sufficient to give a breakdown value greater than that desired, the thickness of the coating being then reduced in an acid bath to the thickness which gives the desired breakdown value. The coated metal may then be annealed to stabilize the breakdown characteristics of the coating. Copper may be oxidized at about 1055 DEG C. to form a coating of red and black oxides, the metal is then cooled and washed in a sulphuric acid bath to remove a substantial proportion of the black oxide and to leave a coating of the desired thickness and breakdown value. The metal is then annealed at about 1000 DEG F. for 11-16 minutes, quenched in a bath at about room temperature, and dried by a current of compressed air the temperature of which is a few degrees lower than room temperature. If the sulphuric acid bath comprises a solution of 35 cc. of commercial acid in 1000 cc. of water and the treatment is continued until only about 5 per cent of the original black oxide is left, the finished article will have a breakdown value of between 50 and 90 volts.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US466251XA | 1935-10-24 | 1935-10-24 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB466251A true GB466251A (en) | 1937-05-25 |
Family
ID=21944461
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB28542/36A Expired GB466251A (en) | 1935-10-24 | 1936-10-20 | Improvements in and relating to electric cutouts |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB466251A (en) |
-
1936
- 1936-10-20 GB GB28542/36A patent/GB466251A/en not_active Expired
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